Barium sulfate and strontium sulfate scale inhibitor, preparation method and application thereof

A technology of antiscalant and chelating agent, applied in chemical instruments and methods, descaling and water softening, special treatment targets, etc., can solve oil field production and stable production hazards, affect oil and gas field development benefits, etc., to prevent pipe string and Formation scaling, barium strontium sulfate scale inhibition, low price effect

Active Publication Date: 2019-03-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For water injection development oilfields, due to the quality of injected water not up to standard or the incompatibility of injected water and formation water, as well as changes in formation temperature and pressure, etc., scaling will often occur in formations, downhole strings, and surface pipelines, and barium and strontium scales are relatively tight , hard, it adheres to the pipe wall very firmly, it is difficult to remove with general acid-base solution, it is the most difficult type of scale to deal with in oilfield water, it brings great harm to oilfield production and stable production, and seriously affects the development benefits of oil and gas fields

Method used

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  • Barium sulfate and strontium sulfate scale inhibitor, preparation method and application thereof
  • Barium sulfate and strontium sulfate scale inhibitor, preparation method and application thereof
  • Barium sulfate and strontium sulfate scale inhibitor, preparation method and application thereof

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Embodiment 1

[0076] This embodiment provides a barium strontium sulfate scale inhibitor, the total weight of the scale inhibitor is 100%, and the scale inhibitor is prepared from raw materials comprising the following weight percentages:

[0077] Chelating agent 10%;

[0078] Initiator 1%;

[0079] Phosphorous acid 3%;

[0080] Acrylic acid 6%;

[0081] Regulator 1%;

[0082] Formaldehyde 1%;

[0083] Surfactant 2%;

[0084] and the remainder of the water;

[0085] In this embodiment, the chelating agent is a 30% aqueous solution prepared from diethylenetriaminepentaacetic acid, citric acid, and hydrolyzed polymaleic anhydride in a mass ratio of 1:2:0.5;

[0086] Described initiator is ammonium persulfate;

[0087] Described acrylic acid is analytically pure acrylic acid;

[0088] The regulator is sodium hydroxide;

[0089] The surfactant is sodium dodecylbenzenesulfonate.

[0090] The scale inhibitor described in this embodiment is prepared by the preparation method comprising t...

Embodiment 2

[0097] This embodiment provides a barium strontium sulfate scale inhibitor, the total weight of the scale inhibitor is 100%, and the scale inhibitor is prepared from raw materials comprising the following weight percentages:

[0098] Chelating agent 10%;

[0099] Initiator 1%;

[0100] Phosphorous acid 3%;

[0101] Acrylic acid 6%;

[0102] Regulator 1%;

[0103] Formaldehyde 1%;

[0104] Surfactant 2%;

[0105] and the remainder of the water;

[0106] In the present embodiment, the chelating agent is diethylenetriaminepentaacetic acid;

[0107] Described initiator is ammonium persulfate;

[0108] Described acrylic acid is analytically pure acrylic acid;

[0109] The regulator is sodium hydroxide;

[0110] The surfactant is sodium dodecylbenzenesulfonate.

[0111] The scale inhibitor described in this embodiment is prepared by the preparation method comprising the following steps:

[0112] (1) Add the acrylic acid and initiator into water, heat to 60°C to dissolve c...

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Abstract

The invention provides a barium sulfate and strontium sulfate scale inhibitor, a preparation method and application thereof. In terms of a total weight of 100%, the scale inhibitor is prepared from the following raw materials by weight percentage: 10%-15% of a chelating agent; 1%-2% of an initiator; 3%-5% of phosphorous acid; 5%-10% of acrylic acid; 1%-2% of a regulator; 1%-2% of formaldehyde; 2%-4% of a surfactant; and the balance water. The scale inhibitor provided by the invention has stable performance and long service life, can be preserved and used for a long term, can effectively prevent shafts, surface pipelines and equipment from scaling, especially has good scale inhibition ability on calcium sulfate, barium sulfate, strontium sulfate, etc., and can ensure pressure-controlled water injection.

Description

technical field [0001] The invention relates to a barium strontium sulfate scale inhibitor and its preparation method and application, belonging to the technical field of petroleum development. Background technique [0002] For water injection development oilfields, due to the quality of injected water not up to the standard or the incompatibility of injected water and formation water, as well as changes in formation temperature and pressure, etc., scaling will often occur in formations, downhole strings, and surface pipelines, and the barium and strontium scales are relatively tight , hard, it adheres to the pipe wall very firmly, it is difficult to remove with general acid-base solution, it is the most difficult type of scale to deal with in oilfield water, it brings great harm to oilfield production and stable production, and seriously affects the development benefits of oil and gas fields . According to reports, the economic losses caused by fouling of oil and gas wells...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14C02F103/10
CPCC02F5/14C02F2103/10C02F2303/22
Inventor 邓志颖慕立俊陆红军姚斌姬振宁张随望王勇陆小兵宋昭杰王尔珍
Owner PETROCHINA CO LTD
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